Hydraulic cap mechanism for sugar-cane mills.



J. I. BUYER: I HYDRAULIC GAP MECHANISM FOR SUGAR CANE MILLS.

APPLIGATION FILED APR.7, 1909,

976,144. Patented Nov. 22, 1910 nucntoz Wihwobeo' UNITED STACE PATENTDFFICE.

JESSE I. BOYER, READING, PENNSYLVANIA, ASSIGNOR TO READING IRON COM-IPANY, OF READING, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

HYDRAULIC CAP MECHANISM FOR SUGAR-CANE MILLS.

Specification of Letters Patent.

Patented Nov. 22, 1910.

Application filed April 7, 1909. Serial No. 488,468.

sugar-cane mills or the like in which the- I pressure exerted upon therolls is automatically limited by. providing a yieldinghydraulic-plunger backing for the rolls.

The object of my invention is to provide an improved constructionwhereby the handling of cumbersome parts for repairs and renewals asordinarily required, will be practically avoided and the propermaintenance of the machine greatly facilitated.

Figure 1 is a partial end elevation of a sugar mill embodying myimprovements, the top-cap being shown in section and the plunger plugremoved. Fig.2 is a vertical section on the line 2-2 of Fig. 1; and Fig.3 is a plan view of the plunger-plug.

In the drawing that portion only of the housing 2 is shown, in which theshaft 3 of the top roll et of a-sugar-cane mill is mounted; thepositions of the usual coacting rolls being merely indicated by thedotted lines 5 and 6. The top bearing 7 of the shaft 3 is verticallymovable in the housing andis backedby a hydraulic plunger 8 so as to.permit the roll torise as usual for the passage ot any accidentallyintroduced mate-- rial that would otherwise subject the machine to unduestrains.

The plunger 8, which is provided at its upperfend with a cupped leatherpacking ring 9, is fitted to a suitably lined hydraulic cylinder 10.-This cylinder, as shown, is formed in a top cap 11 which is secured bybolts, as indicated, to the housing 2; and its bore extends entirelythrough the cap so that the plunger may be introduced or withdrawn ateither end while the cap remains rigidly secured to the housing.

In connection with the plunger 8 and open-end cylinder 10, I provide aplungerplug in the upper end of said cylinder.

The lower end of this plug is provided with a cupped leather packing 1G,and is spaced apart from the packed upper end of the plunger 8 so as toprovide an intermediate chamber for the compressing 1nedium,which latteris introduced as indicated through an opening 17 and a connected conduit18. This plug is adapted to be readily inserted into and removed fromthe open upper end of the cylinder, and provision is made for quicklylocking it in inserted position by means, as shown, of locking ears 19,19

formed on its projecting upper end and arranged to be engaged ordisengaged by rigid locking lugs 20, 20 on the top of the cap by givinga quarter-turn movement to the inserted plug.

hen the mill is in operation the hydraulic pressure bears equally uponthe plug '15 and plunger 8, leaving the latter free to yield whenrequired to relieve the rolls from excessive strains, while the plug isrigidly retained by the locking lugs 20. If access to the plunger isrequired however, as to renew the packing. this is readily accomplishedby disengaging and withdrawing the plug without removing any cumbersomepart of the machine.

lVhat I claim is The combination with the housing, the movable rollbearing therein, and the projecting housing bolts, of the removablysecured housing cap engaged by said projecting bolts and formed with anintermediate hydraulic cylinder having'a bore of uniform diameterthroughout open at both ends and overhanging plug-locking lugs, apressure controlled plunger in the lower portion-of said cylinderforming a movable backing for said roll bearing, and an independentlyremovable plunger-plug insertible into said cylinder through the openupper end thereof and provided with lug-engaging cars adapted to locksaid plug in fixed position in the cap, substantially and for thepurpose set forth.

In testimony whereof, I affix my signature, in the presence of twowitnesses.

' JESSE I. BUYER. itnesses

